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Discussion Starter · #1 ·

Disclaimer, not a mechanic. Just trying to get a bit more life from my trusty Cobalt since now is not a great time to be investing in a new car.

Basically, whenever I'm coming to a stop the speedometer may jump up to 30-40mph and the RPMs will spike. More often than not the car stalls. I've also noticed this occurring when shifting to reverse.

No check engine light or codes.

Here's a video of it in action:

So far, I've done the following:

  • Cleaned throttle body
  • Cleaned mass air flow sensor
  • Replaced the PCV valve hose with OEM (noticed that this was severely damaged while performing the other stuff)

Some research pointed me towards needing to "relearn the idle position" after cleaning the throttle body. I attempted the steps I found and just had the car on a pretty decent highway drive. Stalled out a few times making it to the highway ramp, but after getting a good 30-40 minute drive it was much better on the way home. Meters still jumped a few times coming to a stop on my way back, but no stalls.

Excuse the ignorant question, but could it be something electrical related? Right around when this started happening I noticed that my radio would randomly change stations and the dials would not work until I powered the radio off and back on again.

Any help or guidance would be greatly appreciated!
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